vague

vague (FR ADJ ARCH) errant, vagabond; (1531) hard to grasp, due to a fluid, poorly defined or established character; imperfectly perceptible; imprecise. First appears in French in the 14th century, from Latin vagus. (Bourget, Brimont, Fargue, Samain, van Lerberghe, Verlaine, Vilmorin)